Automatic stop for grinding-mills.



l.. DELLERT.

AUTOMATIC STOP FOR GRINDING MILLS. APPLICATION FILED APR. 24. I9I1.

1,241,935. Patented oct. 2,1917.

i 6,/ s SHEETS- SHEET I.

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I V l l 45 f .35 m Il 30 i Q I ,87 /j /0 /3 2.5' I, I l\ L 42M f Lamis'Dd/ew' "/"fa *d l L. DELLERT.-

AuToMATlC STOP FOR GRINDING MILLS.

APPLICATION FILED APR. 24.1911.

Patented Oct. 2,1917.

3 SHEETS-SHEET 2.

Tia-5- W/TNESSES ATTORNEYS L. DELLERT.

AUTOMATIC STOP FOR GRINDING MILLS.

APPLICATION FILED APR. 24. I9I7.

1,241,935. Patented oct. 2,1917.

3 SHEETS-SHEET 3.

IIIf-QII INVENT? A TTORNEYS OFFICE.

LoUIs DELIJERT. 'oF-= 1111001; m n' AUTOMATIC s'rr For.lVenturina-MILLS.

Specioation of Leit-ters Patent.

Patented oct. a, 1917.

' .ppneauon ined April 24, 1917. serial No. 164,114.

To all whom t may concern:

Be it known that I, LOUs DELIjER'r,

of the city of New York, boroughof Brooklyn, in the county of Kings andState of New York, have invented a new and Improved Automatic Stop for.Grinding-Mills, of which the following is a full, clear, and exactdescription.

The invention relates to mills for grinding coffee,dried cereals andother materials, and its object is to provide amew and improvedautomatic stop controlled by the material to be ground between'twogrinding members to stop the driving means for the mill immediatelyafter the last portion of the material 'is passing out between thegrinding members.

In order to produce the desired result, use is made of a pair ofcoacting grinding members adapted to grind the material between them,one of the grinding members being driven to rotate in one direction andthe other grinding member being mounted to oscillate, a spring deviceIconnected with the said oscillating grinding member in the direction inwhich the other grinding member is rotating, and stopping means for themill controlled by the said spring device.

yA practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification, in whichsimilar' 'characters of reference indicatecorresponding parts in all theviews.

Figure l is a .sectional side elevation of a grinding mill provided withthe automatic stop; y

Fig. is a side elevation of the same with rparts in section;

Fig is a sectional plan view of the same on the line' 3--3 of Fig. 1;

Fig. 4 is a cross section of the same on the line fl-t of Fig. 1 andshowing diag-rainnlaticall)Y the electric motor and tlu` stoppingmechanism for the same;

Fig. 5 is a similar View of the saine with the parts in a differentposition',

Fig. 6 is a cross .section of the mill on the lnel-6 of Fig. 1,

Fig. 7 is a plan view of the electric switch with the switch handleshown in section; and

Fig. S is a side elevation ot' the grinding mill and a portion oftheelectric motor for driving the same.

In the casing 10 of the grinding mill is a citizen of the United States,and a resident mounted to turn a shaft 11 on which is secured a grindingmember 12, preferably in the form of a disk, having grinding teeth 13 onone face. The grinding teeth 13 coact with similar grinding teeth'l4arranged on an oscillating grlndmg member 1o to grind the materialbetween the members 12 and 15, as hereinafter more fully explained. Thegrinding member 12 is continually drivenin one direction, and for thispurpose the shaft 11 is coupled with the vshaft 20 of a motor anyapproved construction. p

The hub-of the rotary grinding member 12 1s 1n the form of a feed screwand ex'- 21, preferablv of the electrical type andof grinding member 15and this hub 26 is provided with an inlet opening 27, preferably7located on the top and in register with a hopper 28 for feeding thematerial to the feed screw which delivers the' material between thegrinding faces of the grinding members 12 and 15.. The oscillatinggrinding member 15 is provided with an annular flange 30 extendingacross the peripheral face ofthe rotary grinding member 12. and in thelower portion of this Flange 30 is formed an outlet 31 fordischarging'the ground material through an opening 32 formed in thebottom'of the easing 10. The outlet 31 is surrounded bv a ring 33,preferably made ot' rubber, and adapted to abut against the walls of theoutlet opening as will be readil)v understood by. reference. to Fig. (l.The top of the `flange 30 is provided with a pin 34- surrtunuled b vjaring 35 of rubber or similar inaterial.':1nd this ring is adapted toabut against one side 36 of an extension, 537 of the easing 10. and isalso adapted to abut againsta screw 38 screwing inthe side wall of theextension 37 f lireetlwv opposite tlu` wall 3V. By the arrangementdescribed. the oscillating movement of .the grinding nulnber 15is'lilnited and the outlet Pil 'is always in register with the-eorrelspending-hv enlarged outletopening 32 of the easing. f

Inl the end of the huh 2G of lheoseillating grinding member 15 isarranged a ltransversely extending holt 40. on one-end of which ispiroted an angular of'lfset of a hook 42 proridedon its shank with acollar -l-B on which is seated ,the lower end of a spring -l-l restingwith its upper end in a cup 45 attached or formed on a plate 46 securedto tends within the hub 26 of the oscillating the housing 10. Normallythe spring 4st is in the extended position shown in Fig. 4, but when themill is ruiming and the material to be ground passes between thegrinding faces of the grinding members 12 and l5 then the grindingmember 15 is caused torotate in the direction in which the grindingmember 12 is rotating by the action of the material on the teeth 11 ofthe grinding member 15. The oscillating movement given to the grindingmember 15 in the direction of the arrow a' causes a compression of thespring 11 (see Fig. 5), and when the last portion of the material isground and passes out from between the grinding faces of the grindingmembers 12 and 15 then the spring +1 returns the grinding member 15 toits normal position. Thus the oscillating movement of the grindingmember 15 in one direction is controlled by the material passingbetweenthe grinding faces of the grinding members 12 and 15 to be ground, andthe return movement of the oscillating member 15 is accomplished by thespring 44:.

The hook -12 controls a switch 50 arranged in a circuit 51 of the motor21, and this switch is preferably of the knife type and is arranged asfollows, special reference being had to Figs. 1, 2, 4, 5 and 7. On theplate 1G is secured a block 54,- of rubber or other insulating material,and on this block are arranged brackets engaged by the pivots 5(3`of theside arms of a switch lever 5T adapted to engage contact members 5S heldon the block 51. The side arms of the switch lever 5T are connected witheach other by crossbars 59 of rubber or other suitable insulatingmaterial, and on the said crossbars 59 is secured a bail (SO carrying ahandle ('1 extending through a slot 62 formed in a switch casing 6?attached to the casing 10, the said casing having a bearing portion (ilinclosing the spring 41. and the bolt l0. The bail GO is provided with ashoulder (35 adapted to be engaged by the head GG of the hook l2 toswing the switch lever 5T from closed in to open position', .ishereinafter more fully explained. The bail (3() is provided above theshoulder 65 with. a stop arm GT adapted to be engaged by the head (5G ofthe hook 12 to limit the upward movement thereof. Owing to the offset-11 on the spring-pressed hook 42 the latter tends to swing to the rightagainst a shoulder GS formed on the plate 16 to properly engage the head('t of the hook 42 with the shoulder (S5 at the time thc switch isclosed (see Fig. 5) to subsequently swing thel switch into openposition. The shoulder 68 swings the hook 12 to the left with a View todisengage the head 66 from the shoulder at the time the oscillatinggrinding member 15 nears the end of its return movement (see Fig. l).The bail (30 is provided with a rubber bumper 59 adapted to engage theblock 51 to limit the swinging movement of the switch lever 5T.

lVhen the switch is in the open position .shown in Fig. 1 and it isdesired to start the mill, then it is only necessary for the operator totake hold of the handle G1 and swing the same over to the left to engagethe switehlever 57 with the contact 5S to close the circuit 51 for themotor 21 so that the latter is started and the rotary grinding member 12is rotated.

The material to be ground and fed through the hopper 28 passes into thehub 2G and is fed by the feed screw between the grinding faces of thegrinding members 12 and 15. vand this material. acts on the grindingmember 15 to oscillate the latter against the tension of the spring 11.During this oscillating movement of the grinding member 15 in thedirection in which the other grinding member is running, the hook 12assumes the position .shown in Fig. 5. 'hen the material has been groundand the last portion thereof is passing out from between the grindingfaces then. the spring' 41 turns the grinding wheel 15 in the reversedirection of the arrow a' and at the same time the hook l2 engages withits head 66 the shoulder G5 thus iinpartinga swinging motion to theswitch lever 5T to disconnect the latter from the contact 58. The motorcircuit is now broken and the motor comes to a stop.

The end of the hub 2G abuts against an abutment S0 forming a bearing forthe adjacent ends of the shafts 11 and 20, and in loo order to take upwear the head S1 of the bolt l() previously mentioned is made conicaland abuts at one side against a shoulder S2 forming part of the, casing10. It will be noticed that on screwing up the nut S3 105 of the bolt+10, the head S1 thereof by bear. ing against the shoulder 82 forces thehub 2G and consequently the grinding wheel 15 to the left and againstthe abutment 81., The shaft 11 and its grinding wheel 12 can" 11o beadjusted relative to the oscillating grinding wheel 15 by the use of ascrew S5 screwing in the outer end of the bearing Sti in which theright-hand end of the shaft 11 is jmirnaled. Thus b v the arrangementde- 115 .scribed the wear of the grinding member 15 in its bearing canbe taken up and the other grinding member 12 can be adjusted to keep thegrinding faces of the said grinding wheels 12 and 15 at all times in 120the proper relation to each other to grind the material to the desiredfineness.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a grinding mill, a pair of enacting grindingmembers adapted to grind the material between them, one of the grindingmembers being driven to rotate in one di# rection and the other grindingmember be- 13e ing mounted to oscillate, a spring device connected vwiththe said oscillating grinding member and placed under tension onoscillating the said oscillating grinding member in the direction inwhich the other grinding member is rotating, and stopping means lfor themillvcontrolled by 'the said spring device.

EZ. In a grinding mill, a pair of coacting grinding members adapted togrind the material between them, one of the grinding members beingmounted to turn continuously in one direction and the other grindingmember being mounted te oscillate, a resistance connected with the saidoscillating grinding member and opposing the oscillating of theoscillating member in the direction in which the other grinding memberis rotating, and means carried by the oscillating member for limitingoscillation thereof.

S. In a grinding mill, a pair of coacting grinding members adapted togrind the material between them, one of the grinding members beingmounted to turn continuously in one direction and the other grindingmember being mounted to oscillate, driving means for the said rotarygrinding member, a spring connected with the said oscillating grindingmember to oppose the latter`s oscillation in the direction in which theother grinding member is rotating, and means connected with the saidoscillating grinding member and the said driving means /to stop thelatter on the return movement of the'oscillating grinding member.

4. In agrinding mill, a pair of coacting grinding members adapted togrind the material between them, one ofthe grinding members beingmounted to turn continuously in Vone direction and the other grindingmember vbeing mounted to oscillate, an electric motor driving the saidrotary grinding member, a spring opposing the said grindingmembel.' onthe latter turning in the 'direction in which the other grinding memberis rotating, and a shut-oil"v switch for the said electricmotor andconnected with the said' oscillating grinding member lto stop the motor,on the return of the said oscillating member 4caused by the said spring.

5. In a grinding mill, a pair of coacting grinding members adapted togrind the material between them, one of the grinding members beingmounted to turn continuously in one direction and the other grindingmember being mounted to oscillate, an a rmon the said loscillatinggrinding .member, a hook pivnted on the said arm, a spring pressing thesaid hook, and a motor controlling means adapted to be engaged by thesaid hook to stop the motor on the return movement of the oscillatinggrinding member by the action of the said spring.

6. In a grinding mill, ay pair of coacting grinding members adapted togrind the material between them, one of the grinding members beingmounted to turn continuously in one direction and the other grindinglmember being mounted to oscillate, driving means for the said rotarygrinding member, an arm o n the said oscillating grinding member, a hookpivotally connected with the said arm, a spring pressing the. said hook,and a switch controlling the said drivingmeans and adapted to be engagedby the said hook to open the switch and stop the said motor on thereturn movement of the said oscillating grinding member caused by thesaid spring.

7. In a grinding mill, a pair of coacting grinding members adapted togrind the materialv between them, one of thegrinding members. beingmounted to turn f continuously in one direction and the other grindingmember being mounted to oscillate, driving means for the said rotarygrinding member, an arm on the said oscillating grinding member, a. hookpivotally connected with the said arm, aspring pressing the said hook, aswitch controlling the said driving means and adapted to be engaged bythe said hook to open the switch and stop the said motor on the returnmovement of the said oscillating grinding member caused by the saidspring, andmeans to disengage the said hook from the said switch afterthe grinding members adapted to grind thematerial between them, one ofthe saidk grinding members being-mounted to rotate and the other beingmounted to oscillate, means for continuously rotating the said rotarygrinding member, a feed screw'fon the said rotary member to `feed thematerial between the said grinding members, the said oscillatinggrinding member having a lhub inclosingthe said. feed screw, the hubhaving an inlet opening, the said oscillating grinding member having anannular Aliange extending across the peripheral'face of the said rotary.grinding member, the flange having an outlet opening, and a hopperconnected with the said inlet opening.

9. In a grinding mill. a pair of coacting grinding members, of which oneis driven and. provided with a feed screw to feed the material betweenlthe grinding members, the other grinding member having a hubinclosingthe said. feed screw, a bearing ing grinding members adapted togrind the 'lim material between them, one of said grinding membersmounted to rotate continuously and the other grinding),r member mountedto oscillate, means for feedinff the material from the inlet and betweenthe said grinding members, said oscillating grinding member havingT anannular flange extending across the peripheral face of said rotarygrinding member, the flange having an ontlet opening, and means carriedby the oscillating grinding member maintaining the outlet in said fianqein registry with the aforesaid outlet of the casing.

LGUIS DELLERT.

